Polymer derived ceramic fibers having improved thermal stability
US5238742A · kind A · utility
5Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1991 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Dec 16, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2918
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to ceramic fibers of the Si-C-N-O series with a diameter less than about 20 micrometers. It has been unexpectedly found that the thermal stability of these fibers can be increased by minimizing the impurity content, primarily the content of metals or metallic compounds. Such fibers with low levels of contaminants retain greater than about 60 percent of their initial tensile strength when subjected to temperatures of 1300.degree.-1400.degree. C. for at least 30 minutes in a non-oxidative environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.